Rotary feeder with cleaning nozzles

A system comprising:

• one or more polymerization reactors configured to produce a product polymer;
• a vessel configured to receive the polymer product produced in the one or more polymerization reactors, wherein the vessel comprises a flash unit, a purge column, a polymer product storage silo, an extruder, a primary degasser, a secondary degasser, an extruder feed tank, or a combination thereof;
• and
• a rotary feeder comprising a stationary, cylindrical housing having disposed therein a number of injection nozzles, and within which rotate a plurality of vanes about a central axis, wherein the housing defines an inlet and an outlet, and extends a width along the central axis, wherein each of the vanes has a length along the central axis, and wherein the injection nozzles are positioned across the width of the housing, such that a spray pattern of a gas injected via the number of injection nozzles spans substantially the entire length of the vanes, wherein the rotary feeder is downstream of the vessel and fluidly connected therewith, via the inlet of the rotary feeder, whereby product polymer is introduced thereto.